Battery Electrode Loading Diagnosis from Full-Cell Voltage Profiles
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Solution Overview
Problem
Current methods cannot accurately determine the composition ratio of active material, conductive material, and binder in a battery's positive electrode without disassembling it, affecting battery performance consistency.
Innovation Solution
A battery diagnosis apparatus and method that uses a profile determination unit to adjust reference profiles to fit a measured full-cell profile, calculating positive electrode loading amount and comparing resistance and loading amount ranges to diagnose the condition of the battery, allowing non-destructive assessment of active material, conductive material, and binder amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the battery is disassembled to directly analyze the electrode composition ratio, then measurement precision is improved, but device complexity and loss of time increase
Solution Approach 1:
The patent replaces the mechanical disassembly approach with an electrical measurement system. By applying alternating current at multiple frequencies and measuring impedance characteristics, the system can determine the composition ratio of active material, conductive material, and binder without physically disassembling the battery. This electrical field-based measurement substitutes the mechanical field-based disassembly approach.
Solution Approach 2:
The patent introduces impedance measurement as an intermediary method to indirectly determine the composition ratio. Instead of directly observing the electrode composition through disassembly, the system uses impedance characteristics at different frequencies as an intermediary to infer the composition ratio, thereby avoiding the need for physical disassembly while maintaining measurement precision.
2Measurement precision
If the battery is disassembled to analyze electrode composition, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent performs preliminary impedance measurements at multiple frequencies before any disassembly occurs. By pre-establishing the frequency-impedance relationship and using this data to calculate the composition ratio, the system eliminates the need for time-consuming disassembly processes. The preliminary electrical characterization provides all necessary information for composition analysis.
Solution Approach 2:
The patent replaces the time-consuming mechanical disassembly and physical analysis process with rapid electrical impedance measurements. The electrical measurement system can determine composition ratio in minutes through frequency-domain analysis, whereas disassembly and physical analysis would take significantly longer.
3Ease of operation
If non-destructive diagnosis method is used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent uses dynamic impedance measurements at multiple alternating current frequencies to extract composition information. By varying the frequency dynamically and analyzing the impedance response at each frequency, the system can differentiate between active material, conductive material, and binder contributions. This dynamic multi-frequency approach enables precise composition determination through non-destructive means.
Solution Approach 2:
The patent changes the electrical parameters (current frequency and amplitude) to extract different composition information. By measuring impedance at multiple frequencies and analyzing how the impedance varies with frequency changes, the system can calculate the composition ratio with high precision. The parameter changes in the electrical measurement enable differentiation of various electrode components without physical disassembly.
Data Source
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AI summary
A battery diagnosis apparatus according to an embodiment of the present disclosure includes a profile determination unit configured to determine a positive electrode profile of a battery by adjusting a reference positive electrode profile and a reference negative electrode profile to fit into a measured full-cell profile indicating a correspondence relationship between capacity and voltage of the battery; a loading amount calculation unit configured to calculate a positive electrode loading amount of the battery based on the positive electrode profile of the battery; and a condition diagnosis unit configured to compare a resistance of the battery with a preset resistance range and the positive electrode loading amount of the battery with a preset loading amount range, and diagnose a condition of the battery based on the resistance comparison result and the positive electrode loading amount comparison result.